<br /><p><font size="2">> -> Index Scan using i_oa_2_00_dt_for on t_oa_2_00_dt dt (cost=0.00..5.31
rows=1width=8) (actual time=1.264..1.264 rows=0 loops=50)<br /> > Index Cond: (dt.card_id = c.id)<br
/>> Filter: ((_to >= 1500) AND (_from <= 1550))<br /> > Total runtime: 3399960.277 ms<br
/><br/> Also, are 1500 and 1550 user-supplied parameters or are they part of a small set of possible values? You could
considerhaving a partial index on "card_id WHERE _to >= 1500 AND _from <= 1550". The numbers don't even have to
matchexactly as long as they include all the records the query needs.<br /><br /> Another possibility is using
somethinglike "cube" from contrib to build a GIST index on <_to,_from>. I think you would need to load gist_btree
aswell for the first column on card_id. It doesn't help every use case though, you would have to experiment.<br /><br
/>But before experimenting with either of those things, what does "VACUUM VERBOSE t_oa_2_00_dt" say?</font>
